Kaiser Wilhelm II. The guy that ended up running Germany later was a lot worse.
This is only vaguely correct. He might even have somehow kept the throne by his fungernails had he kept on (or at least passed it to one of his much-more-intelligent children), but he’d basically pissed away all his support and nobody wanted him around anymore. So he left. And even then, WW1 was distinctly a coalition victory.
It was Wilson, not any of the other allied leaders, who publicly said that Wilhelm’s abdication was a mandatory requirement before any negotiations on ending the war could begin.
Friedrich Ebert? The whole thing with the Freikorps was a deal with the devil, but he wasn’t that bad.
Fifteen years later. Adenoid Hynkel.